CN103254931A - Absorption and stabilization system and method for realizing pressure reduction of desorber - Google Patents
Absorption and stabilization system and method for realizing pressure reduction of desorber Download PDFInfo
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- CN103254931A CN103254931A CN2013101275967A CN201310127596A CN103254931A CN 103254931 A CN103254931 A CN 103254931A CN 2013101275967 A CN2013101275967 A CN 2013101275967A CN 201310127596 A CN201310127596 A CN 201310127596A CN 103254931 A CN103254931 A CN 103254931A
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Abstract
The invention discloses an absorption and stabilization system. The system comprises a gas-rich compressor, a condensing oil tank, an absorption tower, a desorber, a stabilization tower and a re-absorption tower, wherein the top of the desorber is connected with and arranged between a primary outlet and a first cooler of the gas-rich compressor through pipelines, or the top of the desorber is connected with a light hydrocarbon recovery plant or hydrogen production plant through a pipeline, and the bottom of the desorber is connected with the stabilization tower successively through a pump, a first heat exchanger and a second heat exchanger. The invention also discloses a pressure reduction method for the desorber of the absorption and stabilization system. According to the invention, on the premise that product quality and yield of the absorption and stabilization system do not change, pressure reduction of the desorber is realized through changing of flow of desorbed gas, and thus, production cost is saved.
Description
Technical field
The present invention relates to the refining of petroleum field, particularly the method for absorbing-stabilizing system and realization desorption tower reduced pressure operation.
Background technology
Absorbing-stabilizing system is the indivisible integral parts of core crude oil secondary processing device such as catalytic cracking, delayed coking, hydrocracking, mainly be made of rich gas compressor, condensing oil tank, absorption tower, desorption tower, stabilizer tower, reabsorber and corresponding cold exchange device, its effect is to utilize rich gas and the raw gasline (or raw naphtha) of the in the future autonomous fractionating column system of the method for absorption and rectifying to be separated into the qualified stable gasoline of dry gas, liquid hydrocarbon and vapour pressure (or petroleum naphtha).
Absorption and desorption part in the absorbing-stabilizing system has two kinds of flow processs, i.e. single tower flow process and double-column process usually.Single tower flow process collects absorption, desorb in a tower, and double-column process is then separately finished it in two towers, can satisfy high-absorbility and high desorption efficiency simultaneously, so use more.
(see figure 1) in the double-column process is compressed to specified pressure from the compressed machine of the rich gas that is rich in liquid hydrocarbon and gasoline component of main fractionating tower cat head catch pot, and condensing oil tank is advanced in cooling then, isolates gas phase and liquid phase; Gas phase is entered the absorption tower subsequently, relies on raw gasline and stable gasoline (claiming to replenish absorption agent again) to remove C wherein
3 +Component obtains the lean gas of " more dried " relatively from cat head, and is rich in C
3 +The rich absorbent oil of component is then delivered to condensing oil tank by extracting out after cooling at the bottom of the tower.In order in time to take the heat that absorption process discharges away, keep its lower temperature operation, the absorption tower generally is provided with two and establishes middle water recirculator.The lean gas that the self-absorption cat head comes out removes reabsorber then, by the further absorption of diesel oil C wherein
3 +Component is to obtain C
3 +Component concentration is lower than 3%(mol) the product dry gas, rich diesel oil then returns the main fractionating tower freshening at the bottom of the tower.The effect of desorption tower then is at the bottom of the tower again under the effect of boiling hot amount, with the C that is dissolved in the condensed oil
2Component desorbs, and is drawn by condensing oil tank by cat head and to send the absorption tower to enter next circulation, and deethanizing gasoline is then delivered to stabilizer tower at the bottom of the tower, at the C that removes wherein
3, C
4Component is that to become qualified gasoline products behind the liquid hydrocarbon (LPG) be stable gasoline or petroleum naphtha.
In the above-mentioned flow process, desorb overhead gas and rich gas mix.Because the former C
3 +Concentration of component is well below the latter, so mixing process is that the desorb overhead gas seriously degrades and thermodynamics mixes fire with decreasing great process, so be necessary otherwise processed; In addition, because flow arrangement desorb overhead gas advances condensing oil tank freshening, so force desorption tower to operate with elevated pressures, this not only is unfavorable for desorb, improve the desorb column bottom temperature especially, thereby had to do again boiling hot source with high-quality 1.0MPa steam, taken off C with its function
2Be not complementary.If can change the trend of stripping gas, it is sent to one than the unit of low operating pressure, then not only can reduce the working pressure of desorption tower, improve desorption effect, can also reduce the service temperature of desorption tower, low temperature exhaust heat with device is done the desorb thermal source, thereby saves 1.0MPa steam and reduce the waste heat cooling load.The present invention just is being based on that this point is considered and is proposing.
Summary of the invention
The objective of the invention is to overcome in the existing absorbing-stabilizing system flow process for stripping gas being introduced condensing oil tank the desorption tower pressurized operation, thereby cause desorb column bottom temperature height, reboiler to use high-quality thermal source to increase the shortcoming of system energy consumption, a kind of reduced pressure operation method that can reduce the absorbing-stabilizing system flow process of desorption tower working pressure and desorption tower is provided is provided.
For new project, purpose of the present invention is achieved through the following technical solutions:
A kind of absorbing-stabilizing system comprises rich gas compressor, condensing oil tank, absorption tower, desorption tower, stabilizer tower and reabsorber; During work, rich gas enters middle knockout drum after the compression of rich gas compressor one-level, the cooling of first water cooler, and separated liquid arrives condensing oil tank through pump delivery; Separated gas mixes with oil at the bottom of the absorption tower then through rich gas compressor secondary compression, enters the condensed oil jar after the cooling of second water cooler, described desorption tower top export by pipe connection to rich gas compressor one-level and first water cooler between; Described desorption tower bottom is connected to stabilizer tower through pump, first interchanger, second interchanger successively.
Realize the method for above-mentioned desorption tower reduced pressure operation, the desorb overhead gas is injected between the outlet of rich gas compressor one-level and first water cooler; Desorption tower is depressurized to low voltage operated.
The method of the above-mentioned desorption tower reduced pressure operation of described realization comprises that also the deethanizing gasoline to obtaining at the bottom of the desorb Tata carries out preheating, is specially:
Follow once or the stable gasoline secondary carries out a preheating with the fractionation cat head, and then once carry out the secondary preheating with stable gasoline.
For transformation project, purpose of the present invention is achieved through the following technical solutions:
A kind of absorbing-stabilizing system comprises rich gas compressor, condensing oil tank, absorption tower, desorption tower, stabilizer tower and reabsorber; During work, rich gas is after the compression of rich gas compressor one-level, the cooling of first water cooler, knockout drum in the middle of entering, separated liquid arrives condensing oil tank through pump delivery, separated gas compresses through the rich gas compressor secondary, mix with oil at the bottom of the absorption tower then, enter the condensed oil jar after the cooling of second water cooler, light ends unit or device for producing hydrogen are arrived by pipe connection in described desorption tower top; Described desorption tower bottom is connected to stabilizer tower through pump, first interchanger, second interchanger successively.
Realize the method for above-mentioned desorption tower reduced pressure operation, desorb cat head pneumatic transmission is gone into light ends unit or device for producing hydrogen; Desorption tower is depressurized to low voltage operated.
The method of the above-mentioned desorption tower reduced pressure operation of described realization comprises that also the deethanizing gasoline to obtaining at the bottom of the desorb Tata carries out preheating, is specially:
Follow once or the stable gasoline secondary carries out a preheating with the fractionation cat head, and then once carry out the secondary preheating with stable gasoline.
The present invention is based on following principle:
1, can adopt the method for one or many decompression for the absorption liquid that obtains under the pressurization situation, solute is discharged from absorption liquid, namely the desorption tower reduced pressure operation is conducive to the C in the desorb condensed oil
2Component.
2, reduce desorption pressures, can reduce column bottom temperature., boil again at the bottom of the tower and just can do thermal source with hot water or other low temperature exhaust heats, and need not to use 1.0MPa steam with the energy principle according to step.
The relative prior art of the present invention has following advantage and effect:
1, desorption tower reduced pressure operation, thus the class requirement of relevant device reduced, new project has been saved investment, for transformation project, improved the degree of safety of equipment operation;
2, the desorb column bottom temperature reduces, and tower bottom reboiler can be done thermal source with hot water or other low temperature exhaust heats, thereby has saved 1.0MPa steam;
3, owing to boil again and the preheating of deethanizing gasoline all can be used waste heat at the bottom of the tower, thereby greatly reduce the cooling load of device, this is that new chance has been created in the low temperature exhaust heat utilization of the device of similar band absorbing-stabilizing systems such as catalytic cracking, delayed coking and waste heat surplus.Usually refinery's waste heat is many, and low warm trap is few, and particularly summer, contradiction is more outstanding, and has to use in a large number water-cooled and air cooling.This measure has reduced steam consumption on the one hand, and the load that other aspect is vacateed can be replaced by waste heat, when reducing high-quality energy expenditure, has reduced the cooling load of device;
4, the system principle flow process does not change, so product yield and quality are all unaffected.
Description of drawings
Fig. 1 is the workflow diagram of existing absorbing-stabilizing system.
Fig. 2 is the workflow diagram of the absorbing-stabilizing system of embodiments of the invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, existing absorbing-stabilizing system workflow is as follows: rich gas (40 ℃, 0.15MPag, 53.1t/h) compresses pressure-raising to 0.5MPag through rich gas compressor one-level C1301-1, be cooled to 40 ℃ by water cooler E1301 then and advance middle knockout drum V1301, separated liquid is be transported to condensing oil tank V1302 by pump P1301AB, gas then compresses pressure-raising to 1.4MPag, with oil at the bottom of the absorption tower (40.8 ℃, 1.4MPag, 153.1t/h), stripping gas (56.5 ℃, 1.4MPag, 10.9kNm through rich gas compressor secondary C1301-2
3/ h) mix, and be cooled to 50 ℃ through water cooler E1302 and advance condensing oil tank.The gas (50 ℃, 1.4Mpag, the 23.5kNm that come out from condensing oil tank
3/ h) compress into absorption tower T1301 certainly.The absorption tower is provided with two side coolers (E1303 and E1304), 40.5 ℃ of tower top pressure 1.21MPag, temperature, (35 ℃, 84.5t/h) is absorption agent with raw gasline, is to replenish absorption agent with stable gasoline (30 ℃, 45.5t/h), and they all inject from first block of plate.Oil is extracted out with the compression rich gas through pump and is mixed cat head lean gas (40.5 ℃, 1.21MPag, 10.5kNm at the bottom of the tower
3/ h) introduce reabsorber T1303.28 ℃ of reabsorber tower top pressure 1.19MPag, temperature, since make absorption agent from the diesel oil (25 ℃, 47t/h) of main fractionating tower, C in absorbing lean gas
3 +After the component, become rich diesel oil (35.6 ℃, 50.3t/h) and extract out at the bottom of the tower, and return the main fractionating tower freshening after heating, cat head then goes out product dry gas (28 ℃, 1.19MPag, 7.5t/h, 8.9kNm
3/ h).
Condensed oil (50 ℃, 189.7t/h) enters first block of column plate of desorption tower T1302 after being extracted out by pump P1302AB, and 56.5 ℃ of desorption tower tower top pressure 1.4MPag, temperature are provided with intermediate reboiler E1306, and its thermal load is 200 * 10
4Kcal/h, 79.4 ℃ of extractions of middle recycle stream, 99 ℃ are returned, and (146.2 ℃, 134.8t/h) does thermal source with the stable gasoline secondary.The thermal load of tower bottom reboiler E1311 is 610.2 * 10
4117.3 ℃ of extractions of recycle stream at the bottom of kcal/h, the tower, 135.9 ℃ are returned, and do thermal source with 290 ℃, 11.1t/h, 1.0MPag steam.Cat head goes out stripping gas (56.5 ℃, 1.4MPag, 18t/h, 10.9kNm
3/ h), mixing with the compression rich gas and advance condensing oil tank through cooling, deethanizing gasoline at the bottom of the tower (117.3 ℃, 171.7t/h) is by pump P1303AB extraction, and 132.2 ℃ are advanced stabilizer tower T1304 after E1305 and stable gasoline (177.5 ℃, 134.8t/h) heat exchange.Stabilizer tower tower top pressure 1.05MPag, 59.7 ℃ of temperature, cold reflux amount 77.2t/h, cat head is provided with water cooler EA1310A-F, E1313A-D, and oil gas is chilled to 45.4 ℃, and cat head goes out liquid hydrocarbon product (45.4 ℃, 36.9t/h).Be provided with reboiler E1312AB at the bottom of stablizing Tata, thermal load is 973.7 * 10
4Kcal/h is with once doing thermal source in the main fractionating tower one.Go out stable gasoline product (177.5 ℃, 134.8t/h) at the bottom of the tower, through going out device with the heat exchange of a deethanizing gasoline and E1307AB cooling back part as product (80 ℃, 89.3t/h), a part ofly continue to cool off as a supplement through E1308AB that absorption agent (30 ℃, 45.5t/h) enters the absorption tower.
Following improvement that the absorbing-stabilizing system workflow of embodiments of the invention has been compared the comparative example flow implementation:
1, before desorb cat head pneumatic transmission rich gas compressor one-level outlet, the interstage cooler;
2, desorption tower cat head working pressure is reduced to 0.5MPag from 1.4MPag;
3, after the desorption tower step-down, column bottom temperature is reduced to 62.7 ℃ from 117.3 ℃, and the recycle stream of tower bottom reboiler returns temperature and is reduced to 83.5 ℃ from 135.9 ℃, and corresponding heating load is from 610.2 * 10
4Kcal/h drops to 146.1 * 10
4Kcal/h; The thermal load of intermediate reboiler then continues to keep 200 * 10
4Kcal/h is constant but extract 53.7 ℃ out, return 73.8 ℃, reduces greatly before all changing.Like this they all available 98 ℃ hot water or other low temperature exhaust heats do thermal source.
4, in view of behind the reduced pressure operation, deethanizing gasoline temperature is lower at the bottom of the desorb Tata, has only 62.7 ℃ (changing preceding 117.3 ℃), so need to implement the preheating of deethanizing gasoline.For this reason, newly-increased one group of interchanger follows once or stable gasoline secondary (doing desorption tower intermediate reboiler thermal source in the former flow process) low temperature exhaust heat of etc.ing is done thermal source with the main fractionating tower top, advances the temperature-resistant of stabilizer tower with assurance deethanizing gasoline.Flow process of the present invention is: do thermal source with main fractionating tower circulation primary (part), be heated to 108 ℃, increase the area of former deethanizing gasoline～stable gasoline interchanger simultaneously, with assurance deethanizing gasoline is heated to 132.2 ℃ and advances stabilizer tower, and do not influence the operation of stabilizer tower.
Two kinds of schemes are specifically arranged:
1, for new project: as shown in Figure 2, absorbing-stabilizing system comprises rich gas compressor, condensing oil tank, absorption tower, desorption tower, stabilizer tower and reabsorber; During work, rich gas enters middle knockout drum after the compression of rich gas compressor one-level, the cooling of first water cooler, and separated liquid arrives condensing oil tank through pump delivery; Separated gas mixes with oil at the bottom of the absorption tower then through rich gas compressor secondary compression, enters the condensed oil jar after the cooling of second water cooler, described desorption tower top export by pipe connection to rich gas compressor one-level and first water cooler between; Described desorption tower bottom is connected to stabilizer tower through pump, first interchanger, second interchanger successively.The step-down method of desorption tower is: with the desorb overhead gas inject the outlet of rich gas compressor one-level and first water cooler cold between; The working pressure of desorption tower cat head is made as 0.5MPag; And the deethanizing gasoline that obtains at the bottom of the desorb Tata carried out preheating: newly-increased interchanger EN1 follows once or the stable gasoline secondary with the fractionation cat head, and deethanizing gasoline is heated to 132.2 ℃.
2, for transformation project, light ends unit or device for producing hydrogen are arrived by pipe connection in the desorption tower top; Described desorption tower bottom is connected to stabilizer tower through pump, first interchanger, second interchanger successively.The step-down method of desorption tower is for to go into light ends unit or device for producing hydrogen with desorb cat head pneumatic transmission; The working pressure of desorption tower cat head is made as 0.5MPag; And the deethanizing gasoline that obtains at the bottom of the desorb Tata carries out preheating: newly-increased interchanger follows once or the stable gasoline secondary with the fractionation cat head, and deethanizing gasoline is heated to 132.2 ℃.
After adopting the present invention, absorbing-stabilizing system operational circumstances and effect are as follows:
1, save at the bottom of the desorption tower 1.0MPa steam 11.1t/h that boils again, press 200 yuan/t of unit price and calculate, 2220 yuan/hour of saving costs are rolled over 1864.8 ten thousand yuan/year;
2, stripping gas is compared comparative example has increased 6.1kNm
3/ h, therefore increasing rich gas compressor secondary compression power consumption 640.3kw(efficient gets 75%), calculate by 0.6 yuan/kwh of electricity price, increase by 384.2 yuan/hour of running costs, roll over 322.7 ten thousand yuan/year;
3, deethanizing gasoline is preheating to 117.3 ℃ of heat requirements 591.4 * 10 from 63.3 ℃
4Kcal/h, boiling hot load 146.1 * 10 again at the bottom of the new technological process desorb Tata
4Kcal/h, they all do thermal source with low temperature exhaust heat, therefore reduce device cooling load 737.5 * 10
4Kcal/h, corresponding minimizing device equivalent recirculated water consume the 922t/h(recirculated water temperature difference and get 8 ℃), press 0.3 yuan of/ton calculating of recirculated water unit price, 276.6 yuan of saving costs/time, roll over 232.3 ten thousand yuan/year;
4, the stable gasoline product is 89.2t/h, and comparing comparative example only increases 0.2t/h; The liquefied gas product is 36.6t/h, compares comparative example and only reduces 0.3t/h; The product dry gas is 7.6t/h, and comparing comparative example only increases 0.1t/h; The material balance that new technological process and comparative example flow process are described is basic identical, and quality product is constant in addition.
To sum up, the present invention is guaranteeing by changing the stripping gas flow process, to realize the desorption tower reduced pressure operation under the constant prerequisite of absorbing-stabilizing system quality product and yield, thereby saves 1.0MPag steam consumption 11.1t/h, reduces device cooling load 737.5 * 10
4Kcal/h, the deduction energy consumption of compressor increases, and comprehensively reduces systematic running cost with 2112.4 yuan/hour, rolls over 1774.4 ten thousand yuan/year.
Above-described embodiment is the detailed embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (6)
1. absorbing-stabilizing system comprises rich gas compressor, condensing oil tank, absorption tower, desorption tower, stabilizer tower and reabsorber; During work, rich gas enters middle knockout drum after the compression of rich gas compressor one-level, the cooling of first water cooler, and separated liquid arrives condensing oil tank through pump delivery; Separated gas compresses through the rich gas compressor secondary, mix with oil at the bottom of the absorption tower then, after second water cooler cooling, enter the condensed oil jar, it is characterized in that, described desorption tower top by pipe connection between the outlet of rich gas compressor one-level and first water cooler; Described desorption tower bottom is connected to stabilizer tower through pump, first interchanger, second interchanger successively.
2. realize the method for the described desorption tower reduced pressure operation of claim 1, it is characterized in that, the desorb overhead gas is injected between the outlet of rich gas compressor one-level and first water cooler; Desorption tower is depressurized to low voltage operated.
3. the method for desorption tower reduced pressure operation according to claim 2 is characterized in that, comprises that also the deethanizing gasoline to obtaining at the bottom of the desorb Tata carries out preheating, is specially:
Follow once or the stable gasoline secondary carries out a preheating with the fractionation cat head, and then once carry out the secondary preheating with stable gasoline.
4. absorbing-stabilizing system comprises rich gas compressor, condensing oil tank, absorption tower, desorption tower, stabilizer tower and reabsorber; During work, rich gas is after the compression of rich gas compressor one-level, the cooling of first water cooler, knockout drum in the middle of entering, separated liquid arrives condensing oil tank through pump delivery, separated gas mixes with oil at the bottom of the absorption tower then through the compression of rich gas compressor secondary, enters the condensed oil jar after the cooling of second water cooler, it is characterized in that light ends unit or device for producing hydrogen are arrived by pipe connection in described desorption tower top; Described desorption tower bottom is connected to stabilizer tower through pump, first interchanger, second interchanger successively.
5. realize the method for the described desorption tower reduced pressure operation of claim 4, it is characterized in that, desorb cat head pneumatic transmission is gone into light ends unit or device for producing hydrogen; Desorption tower is depressurized to low voltage operated.
6. the method for desorption tower reduced pressure operation according to claim 5 is characterized in that, comprises that also the deethanizing gasoline to obtaining at the bottom of the desorb Tata carries out preheating, is specially:
Follow once or the stable gasoline secondary carries out a preheating with the fractionation cat head, and then once carry out the secondary preheating with stable gasoline.
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| CN115999316A (en) * | 2021-10-21 | 2023-04-25 | 中国石油化工股份有限公司 | Absorption stabilization process and absorption desorption coupling tower thereof |
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| CN104593057A (en) * | 2015-01-27 | 2015-05-06 | 华南理工大学 | Low-energy-consumption delayed coking device |
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| CN115999315B (en) * | 2021-10-21 | 2024-06-28 | 中国石油化工股份有限公司 | Internal heat integration type absorption stabilization process |
| CN114307549A (en) * | 2021-12-20 | 2022-04-12 | 华南理工大学 | Process for reducing energy consumption of absorption stabilization system in oil refining process |
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